import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { GuildCommand } from '../entities/guild-command.entity.js';

// This node's guild id (one guild per node).
function guildId(): string {
  return process.env.FABRIC_BACKEND_GUILD_NODE_ID ?? 'guild';
}

@Injectable()
export class CommandsService {
  constructor(
    @InjectRepository(GuildCommand)
    private readonly repo: Repository<GuildCommand>,
  ) {}

  // Replace the whole guild-global slash-command catalog (idempotent;
  // the plugin re-PUTs the full set on every gateway start).
  async sync(commands: unknown[]): Promise<{ status: string; count: number }> {
    const gid = guildId();
    let row = await this.repo.findOne({ where: { guildId: gid } });
    if (row) {
      row.commands = commands;
    } else {
      row = this.repo.create({ guildId: gid, commands });
    }
    await this.repo.save(row);
    return { status: 'ok', count: commands.length };
  }

  async list(): Promise<{ commands: unknown[]; updatedAt: string | null }> {
    const row = await this.repo.findOne({ where: { guildId: guildId() } });
    return {
      commands: row?.commands ?? [],
      updatedAt: row?.updatedAt ? row.updatedAt.toISOString() : null,
    };
  }
}